def ingest(hdfsfile, file_no, datafolders):
"""
:type hdfsfiles: str
:type config: config.Config
"""
try:
process_info = dict()
process_info['process_start_timestamp'] = datetime.utcnow().strftime(
'%Y-%m-%d %H:%M:%S')
process_info['user_name'] = getpass.getuser()
process_info['file_name'] = os.path.basename(hdfsfile)
process_info['file_no'] = file_no
#spark = HiveContext(spark.sparkContext)
file_config = getFileConfig(hdfsfile, config)
if not file_config:
err_msg = "can not find matched file configuration for file %s!" % hdfsfile
logger.error(err_msg)
return 'Error - ' + err_msg
metadata = Metadata(sc)
if hdfsutil.checkDuplicate(config, file_config, hdfsfile):
hdfsutil.move_to_error_archive(config, file_config, hdfsfile,
process_info)
metadata.log_error_table(spark, file_config, config, process_info,
"duplicate file")
return 'Error - a file with same name already exists in archive folder!' + \
' Moved to error_archive "' + process_info['error_archive_path'] + '".'
metadata.loadKVFile(spark, config, file_config.get('kv_file'),
process_info)
reader = Reader(spark)
df = reader.read(hdfsfile, file_config, metadata, process_info)
process_info['row_count'] = df.count()
logger.info("row count in file %s is %d" %
(hdfsfile, process_info['row_count']))
if process_info['row_count'] == 0:
if file_config.get('empty_check', "no").lower() == "yes":
hdfsutil.move_to_error_archive(config, file_config, hdfsfile,
process_info)
metadata.log_error_table(spark, file_config, config,
process_info, "file is empty")
return 'Error - Empty File!' + \
' Moved to error_archive "' + process_info['error_archive_path'] + '".'
else:
hdfsutil.move_to_archive(config, file_config, hdfsfile)
logger.warn('%s is empty!' % hdfsfile)
return 'Success'
validator = Validator(sc)
validator.val_column_num(df.columns, metadata.data_types, process_info)
val_error = validator.get_error()
if val_error:
hdfsutil.move_to_error_archive(config, file_config, hdfsfile,
process_info)
metadata.log_error_table(spark, file_config, config, process_info,
val_error)
return 'Error - ' + val_error + \
' Moved to error_archive "' + process_info['error_archive_path'] + '".'
transformer = Transformer(sc)
df = transformer.trans_data_types(spark, df, file_config, metadata,
process_info)
df = validator.val_data_types(spark, df, file_config, metadata,
process_info)
transformedColumns = [col for col in df.columns if col[:2] == '__']
writer = Writer(sc)
val_error = validator.get_error()
if val_error:
error_df = df.where('length(_error_message) > 0').drop(
*transformedColumns)
writer.write_errorfile(error_df, config, file_config, process_info)
df.unpersist()
logger.error('file %s failed at data type validation' % hdfsfile)
hdfsutil.move_to_error_archive(config, file_config, hdfsfile,
process_info)
metadata.log_error_table(spark, file_config, config, process_info,
val_error)
return 'Error - ' + val_error + \
' Moved to error_archive "' + process_info['error_archive_path'] + '".' + \
' Error file path "' + process_info['error_file_path'] + '".'
else:
orig_columns = [col[1:] for col in transformedColumns]
data_df = df.drop(*orig_columns) \
.drop('_error_message') \
.withColumn('source_filename', lit(os.path.basename(hdfsfile))) \
.withColumn('process_timestamp', to_timestamp(lit(process_info['process_start_timestamp']), 'yyyy-MM-dd HH:mm:ss'))
writer.write_orc(data_df, spark, config, metadata, process_info)
datafolders.add(process_info['hdfs_datafile_path'])
df.unpersist()
hdfsutil.move_to_archive(config, file_config, hdfsfile)
process_info['process_end_timestamp'] = datetime.utcnow().strftime(
'%Y-%m-%d %H:%M:%S')
metadata.log_registry_table(spark, file_config, config,
process_info)
logger.info('file %s has been successfully ingested' % hdfsfile)
return 'Success'
except Exception as e:
logger.error('file %s ingestion failed! exception is %s' %
(hdfsfile, str(e)))
return 'Failed - Exception happened! Please see Yarn log for details'
